TestDU fails on systems with local file systems with extended attributes
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Key: HADOOP-7045
URL: https://issues.apache.org/jira/browse/HADOOP-7045
Project: Hadoop Common
Issue Type: Bug
Components: fs
Reporter: Eli Collins
Assignee: Eli Collins
Priority: Minor
Fix For: 0.23.0
The test reports that the file takes an extra 4k on disk:
{noformat}
Testcase: testDU took 5.74 sec
FAILED
expected:<32768> but was:<36864>
junit.framework.AssertionFailedError: expected:<32768> but was:<36864>
at org.apache.hadoop.fs.TestDU.testDU(TestDU.java:79)
{noformat}
This is because du reports 32k for the file and 4k because the file system it
lives on uses extended attributes.
{noformat}
common-branch-0.20 $ dd if=/dev/zero of=data bs=4096 count=8
8+0 records in
8+0 records out
32768 bytes (33 kB) copied, 9.6e-05 seconds, 341 MB/s
common-branch-0.20 $ du data
36 data
common-branch-0.20 $ du --apparent-size data
32 data
{noformat}
We should modify the test to allow for some extra on-disk slack. The on-disk
usage could also be smaller if the file data is all zeros or compression is
enabled. The test currently handles the former by writing random data, we're
punting on the latter.
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